Minio. upload file via "presigned put object link"

MinioAdapter.java

public class MinioAdapter {
    
    private MinioClient minio;
    
    public MinioAdapter() {
        try {
            this.minio = new MinioClient(MINIO_URL, MINIO_ACCESS_KEY, MINIO_SECRET);

        } catch (InvalidPortException | InvalidEndpointException e) {
            throw new IllegalStateException("Could not start Minio client", e);
        }
    }
   
    public String getUploadLink(String bucket, String key, int expirationSeconds) {
        try {
            // minio.presignedPutObject() didnt work
            return this.minio.getPresignedObjectUrl(Method.PUT, bucket, key, expirationSeconds, null);

        } catch (Exception e) { // whatever
            throw new IllegalStateException(e);
        }
    }

    public String getDownloadLink(String bucket, String key, int expirationSeconds) {
        try {
            return this.minio.presignedGetObject(bucket, key, expirationSeconds);

        } catch (Exception e) { // whatever
            throw new IllegalStateException(e);
        }
    }
    
} 

MinioAdapterTests.java

@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class MinioAdapterTests {    

    private static final TEMPLINK_FILENAME = "uploadable.json";
  
    private static final MinioAdapter MINIO_ADAPTER = new MinioAdapter();
    
    @Test
    public void test1_uploadFileViaTemplink() throws IOException {
        String writeLink = MINIO_ADAPTER.getUploadLink("uploads", TEMPLINK_FILENAME, 60);

        // file from src/test/resources
        InputStream is = this.getClass().getClassLoader().getResourceAsStream("upload-to-s3.json");

        URL url = new URL(writeLink);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setRequestMethod("PUT");
        connection.setRequestProperty(HttpHeaders.CONTENT_TYPE, "application/json");
        
        OutputStream out = connection.getOutputStream();
        is.transferTo(out);  // java 9+
        is.close();
        out.close();

        int code = connection.getResponseCode();
        assertEquals(200, code);
    }
    
    @Test
    public void test2_downloadFileViaTempLink() throws IOException {
        String readLink = MINIO_ADAPTER.getDownloadLink("uploads", TEMPLINK_FILENAME, 5);

        String filepath = "/home/anthony/download-from-s3.json";
        FileUtils.copyURLToFile(new URL(readLink), new File(filepath));
    }
    
}